What does code P1480 mean?

Q: What does code P1480 mean?

Cooling Fan Relay 1 Circuit High Input. P1480 on a Subaru means the engine control module (ECM) has detected an abnormally high voltage on the control circuit for cooling fan relay 1, which typically indicates an open circuit or a short to voltage rather than a failed relay. The ECM commands the relay to ground to turn the fan on, and when it sees voltage above a calibrated threshold on that command wire, it flags the circuit as high input and may default the fan to continuous operation for safety.

DTC codes / Subaru codes / P1480

P1480 · SubaruCooling Fan Relay 1 Circuit High Input

P1480 on a Subaru means the engine control module (ECM) has detected an abnormally high voltage on the control circuit for cooling fan relay 1, which typically indicates an open circuit or a short to voltage rather than a failed relay. The ECM commands the relay to ground to turn the fan on, and when it sees voltage above a calibrated threshold on that command wire, it flags the circuit as high input and may default the fan to continuous operation for safety.

SystemPowertrain

Code typeSubaru specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Subaru vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.